15.4.2 Line Styles

Line styles are specified by the following properties:

linestyle

May be one of

"-": Solid line. [default]
"--": Dashed line.
":": Dotted line.
"-.": A dash-dot line.
"none": No line. Points will still be marked using the current Marker Style.

linewidth

A number specifying the width of the line. The default is 1. A value of 2 is twice as wide as the default, etc.

© 1996–2020 John W. Eaton
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https://octave.org/doc/v6.3.0/Line-Styles.html